The role of ion and electron-scale turbulence in setting heat and particle transport in the DIII-D ITER baseline scenario

Howard, N. T.; Holland, C.; Rhodes, T. L.; Candy, J.; Rodriguez-Fernandez, P.; Greenwald, M.; White, A. E.; Sciortino, F.

doi:10.1088/1741-4326/ac1bc2

The role of ion and electron-scale turbulence in setting heat and particle transport in the DIII-D ITER baseline scenario

Journal Article · Wed Aug 25 00:00:00 EDT 2021 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ac1bc2· OSTI ID:1922667

^[1]; ^[2]; Rhodes, T. L. ^[3]; ^[4]; ^[5]; Greenwald, M. ^[5]; White, A. E. ^[5]; ^[5]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; General Atomics, DIII-D National Fusion Facility
Univ. of California, San Diego, CA (United States)
Univ. of California, Los Angeles, CA (United States)
General Atomics, San Diego, CA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center

In this work, the heat and particle transport in a DIII-D ITER Baseline Scenario (IBS) discharge has been investigated using both linear and nonlinear gyrokinetic simulations performed with the CGYRO code [J. Candy et al: Journal Comp. Phys. (2016)].These simulations were used to investigate the role that ion-scale ($$k_θp_s$$ < 1:0) and electron-scale ($$k_θp_s$$ > 1:0) turbulence play in determining heat and particle transport in the core of conditions believed to directly extrapolate to ITER operation. This investigation spans over nearly half of the plasma minor radius, from ρ = 0:45 - 0:85. To probe the nature of the transport and turbulence in these conditions and to validate the model against experimental fluxes, scans of $$a/L_{T_i}$$, $$a/L_{T_e}$$, and $$a/L_n$$ were performed at all radial locations. Long wavelength turbulence is found to be dominated by ITG modes with strong non-adiabatic electron effects and appears unable to reproduce ion and electron heat fluxes and electron particle fluxes simultaneously at most radial positions when single parameter scans are performed. To investigate the potential role of short wavelength turbulence, a series of electron-scale simulations are performed that indicate that experimentally relevant levels of electron heat flux could arise at sub-ion scales. Quantitative comparison of the simulated fluxes obtained from ion and electron-scale simulations with experimental levels along with the sensitivity of simulations results to changes in inputs is presented. Through extensive sensitivity scans and comparison with multiple transport channels, this work demonstrates a clear need for self-consistent modification of multiple inputs and suggests multi-scale interactions play a significant role at many of the radial locations studied. The results of this analysis help shape our understanding of the model fidelity needed to predict turbulence and transport reactor-relevant conditions and have important implications for the prediction of future fusion devices.

View Accepted Manuscript (DOE)

Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC02-05CH11231; FC02-04ER54698; FG02-95ER54309; SC0017992; SC0018287; SC0019352

OSTI ID:: 1922667

Alternate ID(s):: OSTI ID: 23131849

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 10 Vol. 61; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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